At 10:23 AM 1/21/2004 -0600, Roberto G. Gutierrez, StataCorp wrote:
The data corr2data creates is suitable for one purpose only: performing
analyses when all that is known are the summary statistics and those
summary statistics are sufficient for the analysis at hand. The
artificial data in effect tricks the analysis command into producing the
desired result: The analysis command, being by assumption only a
function
of the summary statistics, extracts from the artificial data the summary
statistics -- which are the same summary statistics you specified -- and
then makes it calculation based on those statistics.
One of the things this discussion has made me think of, is that it would be
nice if there were a few more "immediate" commands, e.g. -regressi-,
-factori-, where you could specify the means, correlations and standard
deviations without the original raw data. Besides getting around the
nuisance of using -corr2data-, such commands would keep you from doing
things you are not supposed to do, such as specifying options that require
the real raw data (i.e. options that require something other than the
means, correlations and sds for the calculations), examination of
residuals, etc. This would seem to be a logical extension of what Stata
already offers and I think it would be a nice addition.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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